hpftodit: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On CentOS possible default full paths are:

/usr/bin/hpftodit - from package: groff

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/hpftodit - from package: groff

You may install the required package with command apt-get install {package}

Error in other languages:
hpftodit: bevel nie gevind nie
hpftodit: comandă negăsită
hpftodit: comando não encontrado
hpftodit: commande introuvable
hpftodit: command not found
hpftodit: käsku ei ole
hpftodit: không tìm thấy lệnh
hpftodit: komanda nerasta
hpftodit: Kommando nicht gefunden.
hpftodit: kommandot finns inte
hpftodit: komut yok
hpftodit: nie znaleziono polecenia
hpftodit: níor aimsíodh an t-ordú
hpftodit: no se encontró la orden
hpftodit: no s'ha trobat l'ordre
hpftodit: opdracht niet gevonden
hpftodit: parancs nem található
hpftodit: perintah tidak ditemukan
hpftodit: príkaz nenájdený
hpftodit: příkaz nenalezen
hpftodit: команда не найдена
hpftodit: командата не е открита
hpftodit: 命令找不到
hpftodit: コマンドが見つかりません